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Use grapes for the demonstration
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The air will enter through the Nose and will pass Nasal passages for the filtering,moistening,and warming of the air down to Trachea  that will go to theBronchi  -> which will go to the Bronchioles for the distribution of air to each -> Alveoli and the exchange of air will happen here. And dont breath to much your lungs will explode thank you.
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